Github user nchammas commented on a diff in the pull request: https://github.com/apache/spark/pull/18926#discussion_r133180053 --- Diff: python/pyspark/sql/tests.py --- @@ -1220,6 +1220,13 @@ def test_rand_functions(self): rndn2 = df.select('key', functions.randn(0)).collect() self.assertEqual(sorted(rndn1), sorted(rndn2)) + def test_string_functions(self): + from pyspark.sql.functions import col, lit + df = self.spark.createDataFrame([['nick']], schema=['name']) + self.assertRaises(TypeError, lambda: df.select(col('name').substr(0, lit(1)))) --- End diff -- I was considering doing that at first, but it felt like just duplicating logic. Looking through the other uses of `assertRaisesRegexp()`, it looks like most of the time we just search for a keyword, but there are also some instances where a large part of the exception message is checked. I can do that here as well.
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